globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.10.019
Scopus记录号: 2-s2.0-84995898068
论文题名:
A late Holocene record of solar-forced atmospheric blocking variability over Northern Europe inferred from varved lake sediments of Lake Kuninkaisenlampi
作者: Saarni S.; Muschitiello F.; Weege S.; Brauer A.; Saarinen T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 154
起始页码: 100
结束页码: 110
语种: 英语
英文关键词: Atmospheric blocking ; Clastic-biogenic varves ; Paleoclimate ; Solar forcing ; Varved lake sediments ; Winter season
Scopus关键词: Biological materials ; Catchments ; Erosion ; Productivity ; Runoff ; Sediment transport ; Sediments ; Solar energy ; Solar radiation ; Atmospheric blocking ; Clastic-biogenic varves ; Lake sediments ; Paleoclimates ; Solar forcing ; Winter seasons ; Lakes ; atmospheric blocking ; atmospheric forcing ; biogenic deposit ; Boreal ; climate variation ; environmental conditions ; geoaccumulation ; Holocene ; paleoclimate ; proxy climate record ; seasonality ; sediment transport ; sedimentation ; winter ; Finland ; Bacillariophyta ; Hexapoda
英文摘要: This study presents a new varved lake sediment sequence from Lake Kuninkaisenlampi, Eastern Finland. The record is constituted by alternations of clastic and biogenic laminae and provides a precise chronology extending back to 3607 ± 94 varve yrs. BP. The seasonality of the boreal climatic zone, with cold winters and mild summers, is reflected in the varve structure as a succession of three laminae from bottom to top, (i) a coarse to fine-grained detrital lamina marked by detrital catchment material transported by spring floods; (ii) a biogenic lamina with diatoms, plant and insect remnants reflecting biological productivity during the season of lake productivity; and (iii) a very fine amorphous organic lamina deposited during the winter stratification. The thickness of the detrital lamina in the lake reflects changes in the rate of spring snow melt in the catchment and is, therefore, considered a proxy for winter conditions. Hence, the record allows reconstructing local climate and environmental conditions on inter-annual to the multi-centennial timescales. We find that minerogenic accumulation reflected in the detrital lamina exhibits a high multi-decadal to centennial-scale spectral coherency with proxies for solar activity, such as Δ14C, and Total Solar Irradiance, suggesting a strong link between solar variability and sediment transport to the lake basin. Increased catchment erosion is observed during periods of low solar activity, which we ascribe to the development of more frequent atmospheric winter blocking circulation induced by solar-forced changes in the stratosphere. We suggest that soil frost in the catchment of Lake Kuninkaisenlampi related to more frequent winter blocking led to increased surface run-off and ultimately to increased catchment erosion during spring. We conclude that, during the past ca 3600 years, solar forcing may have modulated multi-decadal to centennial variations in sedimentation regimes in lakes from Eastern Finland and potentially in other North European lakes. © 2016 Elsevier Ltd
资助项目: We thank for the technical support in the field Hannu Wenho, in the laboratory Arto Peltola, and Peter Dulski with μ-XRF element scanning. The Academy of Finland (Grant no. 123724 and 269834), Kone Foundation (Grant no. 27-5385), and Deutscher Akademischer Austauschdienst (DAAD ; Grant no. D/08/0866) are acknowledged for financial support.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59380
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作者单位: Geology Division, Department of Geography and Geology, University of Turku, Finland; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Uni Research Climate, Allegaten 55, Bergen, Norway; Department of Periglacial Research, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), Potsdam, Germany; Section 5.2 Climate Dynamics and Landscape Evolution, GFZ German Research Centre for Geosciences, Germany

Recommended Citation:
Saarni S.,Muschitiello F.,Weege S.,et al. A late Holocene record of solar-forced atmospheric blocking variability over Northern Europe inferred from varved lake sediments of Lake Kuninkaisenlampi[J]. Quaternary Science Reviews,2016-01-01,154
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